Keen to hear people's opinions about this.
Two DC, father is married with more children. Mother is single.
Father is not on a great wage however his wife has received several payrises in the years they've been together and works in a professional career which means as a whole their household is quite well off and can afford quite a lot of luxuries.
Maintenance is paid by the father based on his low wage. Mother is struggling a little as also on a lower wage.
Mother argues that they should pay more as a household instead due to wife's higher pay, obviously not officially through CMS as they don't take new partners into account, but morally. Wife disagrees and says what she earns is nothing to do with the mother and is for her household/children/ stepchildren when there, not at their mums.
Father stuck in the middle a bit.
Random poll options
YABU - wife should subsidise higher maintenance.
YANBU - Mother and father should care for their children on their own respective wages and what wife earns is nothing to do with the mother.